How do you quickly align one object to another along only one axis?
Begin with the solution you already know, which is to go to Object > Transform > Align Objects, except that instead of left-clicking to choose Align Objects, right-click on it instead, and choose either to create a shortcut, or to add it to your Quick Favorites menu (which will then make it accessible with the 'q' key). The Quick Favorites option is very fast and easy to use, provided you only have one or two items in it at a time (you can have more, but I don't recommend it).